Mechanism for controlling the locks of the computing-numerals in a computing-machine.



G. WALKER; MEGHANISM FOR CONTROLLING THE LOCKS OF THE COMPUTING NUMERALS IN A COMPUTING MACHINE.

APPLICATION FILED JULY 25, 1912.

1 ,O98,855, Patented June 2, 1914.

\X/ITHEESES: Marl-ED UNITED STATES PA I.ENT OFFICE.

GEORGE WALKER, or NEWTON CENTER, MASSACHUSETTS.

MECHANISM IEOR CONTROLLING THE LOCKS OF THE COMPUTING-NUMERALS IN COMPUTING-MACHINE.

Specification of Letters Patent.

Application filed July 25, 1912. Serial No. 711,502.

T 0 all whom it may concern:

Be it known that I, GEORGE lVALKER, a-

Newton Center, in the county of Middlesexj and State of Massachusetts, have invented new and useful Improvements in Mechanism for Controlling the Locks of the Computing-Numerals in a Computing-\Iuchine, of which the following is a specification.

' This invention relates to computing machines, and particularly to typographical computin machines of the kind shown in Letters atent of the United States No. 996,17 3, issued to me June 27, 1911,.and consists in certain improvements upon, and modifications of, the mechanism for operating the locks of the gear wheels which rotate the type wheels or number wheels, or otherwise actuate the computing numerals.

In the following description, and the drawings referred to herein, I describe and show only such parts of the computing machine as are necessary to a clear understandin'g'of the improvements and modifications which constitute'the subject matter of the present application. For a description of the construction and operation of the machine as a whole, reference may be had to my said former patent, and especially to the partof the specification beginning on page 30, line 64, of said patent, which describes those parts ofv the machine immediately associated with the subject of the present invention. For convenience I shall use the same reference numerals as in my said former patent so far as they are a plicable.

Referring to the accompanying rawings, WhlCh show a vertical, longitudinal, sectional view of that part of an adding ma- I tating the chine containing the type wheels, type wheel gears, and mechanism for operatlng the same, to which the present improvement is applied, 1 represents one of the main gear wheels for actuating the com uting numerals, herein shown as carrie by the ty e wheels 3; 11 andll represent respective y the pawl and pawl latch, together constituting a self-locking driving pawl, for roea'r'wheel 1; 18 represents the latch or 100 normally engaging ear wheel 1; 18 represents a piece plvote on shaft 1 18 represents "a pin mounted on the upper arm of piece 18 and engaging the tail of lock 18, to lift the lock 18 when piece 18 is swung downward; 564: represents a shaft extending between the side frames of the machine, of which one is shown at B, supporting a swinging cross bar or latch 566,.norma-lly urged upward by a spring 568; 567 represents a rod conncctedto and extending downward from latch bar 566: 577 represents a swinging arm journaled on a shaft 14, and shaped to strike the nose of latch 11 thereby releasing pawl 11 in any position to which it may be rotated with gear wheel 1; 57 0 is a rod hung on arm 577,

and 572 is a spring tending to pressarm 570 upward; and 560 is a three-arm bell crank lever, the turning of which pulls bar 33--36 to the left as viewed in the drawing. The parts thus far described are of'substair. tially the same construction and perform the same functions as described in my said former patent. It will be understood that there is a similar train of mechanism for each gear wheel 1, that is, for each column of the machine.

The bar 561, instead of being of the same construction as the corresponding part shown-in my said former patent, is of the construction shown in the accompanying drawing, having the upper shoulder 561, engaging the endof the upper arm of piece 18, which is extended far enough to projcct under said shoulder. Bar 5611 also has the lower shoulder 561 There is a part 561 for each column, and said parts 561 are mounted to slide vertically between the teeth of combs 719 and 719, which extend between the side frames of the machine, with their teeth pointing to the left as viewed in thedrawing. Rods 565 and 565' also extend between the side frames of the machine and hold the bars 561 in place in the combs. On the end of the upper arm of bell crank lever-560 is pivoted a latch 56%, engaging shoulder 561 and normally held in the osition shown by spring 560'.

Shaft 717 extends between the side frames of the machine, its ends turning therein.

Bell crank 716 is fastened solidly on shaft 717 inside of side frame B. An arm (not shown identical with the lower arm of bell crank 16 is-fastened solidly on shaft'717 de 'ei' he oppo de ram a d et een d we and h lew we el crank. 7 exte s h W1 8 569* is a in projecting from thelowe'r disengaged from gear wheel 1 at the end end of arm 5 O underbar ,33.36.

Latch 18 is provided with a downwardlyextendingarm 18, which-projects between, the gear wheels 1, and into thev path of swinging arm577. \{Vhen a key is depressed,;it will. cause bell crank lever 560' to swing on its fulcrum as described in my said'fo'rmer patent, thereby causing latch 56%, acting on shoulder 561 to pull part 561 downward. The downward movement of part 56l,'thr'ough the upper shoulder 56 1 which engages the exten ed upper arm of piece 18*, swings piece 18%:

dowfnward', thereby lifting lock 1-8 out of the gear wheel 1, and (by means of the lower arm of 18 setting the locking "pawl;

,11 '-11. 'intothe gear wheel 1. Atthe'comi pletionof the action of piece 18 cross bar. 20

566, acting as a latch, snaps into a notch in the endof the lower arm of 18 holding the lock 18 in its elevated or inoperative 'posi tion. Upon the completion of the foregoing action, the latcii562 will slip oflthe shoulde? 561 thereby disconnecting the bell I crank lever 560 from part 561 and themeclr anism which is operated by 561.

The continued depression of he key'and the consequent swinging of'bell crank 560, brings the projection 33 on bar 33-,-36 (which moves toward the left actuated by bell crank 560) into engagement-withmod 71.8, swinging bell crank lever 716, and pulling downward rod 567, thus removing the latch bar 566 from the notched end of piece '18 ,'and releasing the lock 18 so that it is free to'be reset into gear-wheel 1-. At the sametime'when the projectiori 38 actuates bar- 718, it also engages pin 5B9 acting through link 570 to pull arm 577, towardtheleft, and causing it to strike'the nose of; latch 11 thus releasing the'pawl 11 and simultaneously striking the arm 1.89 '6h lock 18 and positively setting the lock 18 in locked position in the gear wheel; The'action of latch bar 566, which holds/the lock 18 in elevatedposition, and the action of gear wheel:

arm 57?, which simultaneously disengages pawl 11* and sets lock 18, are'relatively so timed that the lock 18 is released by latch bar 566 the instant before the arm 5 77 strikes arm 18 to reset the lock 18 in the -With this construction it will be seen" that .the relocking of the gear wheel 1 is in-no fected positively by the key -action at the end of eachkey operation. It will also bd @SBBII that at no time will the gear wheel 1 be free to rotate accidentally or improperly since it,;is.always positively eiigaged either 1- bylock 18 orby pawl 11 As described in' v {my said former patent, the pawl 11: begins. to-{renter the U teeth of gear, wheel 1 before the lock 18. is fully withdrawn therefrom,

and, conversely when pawl 11 v is being of the stroke, the relation between arr'n 577 :and arm 18? is such that lock 18, positively actuated by said arms,'will again begin to enter between the teeth of said gear wheel before pawl 11 is fully withdrawn there-- front Spring 19 is used as in my said former patent normally to hold said lock 18 in lo'ckedxposition, but in case or the failure of said'gspring for-any-reasonto act prop .erly,- -arms 18- 'aild,577. insure the positive resettingypf'the lock 18 quite independently of thes ring.

- (claim .5

. lnrini-al computing machine, a gearwheel fol-5 actuating the, computing numerals, a lock; .i'norma lly holding said gear wheel against rotation, normally disengaged wheel rotating mechanism to "rotate said gear wheel operating mechanism simultaneously to disengage said-lock and engage said wheel rotating mechanism with the gear wheel, and thento rotate said gear wheel,

means to hold said lock indisengaged po-' sition during the rotation of the gear wheel,

and means actuated'by said operating mechanism adaptedautomatically and positively to reset said lock at. the end of each rotation of said gear-wheel.

2. In acomputingmachine, a gear wheel for actuating 'thecomputing numerals, a lock normally holding said gear wheel against rotation, normally'disengaged wheelrotating mechanism to rotate said gear wheel, operating mechanism simultaneously to disengage'said lock and engage-said wheel;rotating mechanism with the gear wheel, and then torotate said gear wheel,

.means to hold said lock in; disengaged'positionduring the rotation of the gear wheel, and single member actuated by said op crat ng mechanism adapted automatically both-to disengage said wheel-rotating mech- .ani's1n and positively to reset said lock at the end of each rotation ofsaid gear wheel.

. In a computing machine, a gear'wheel for actuating the computing numerals, a lock i normally holding said gear wheel against rotation, normally disengaged wheel-rotating mechanism to rotate said' gear wheel, bperating mechanism simultaneously to disengage said lock and engage said wheel-rotating mechanism withthe-gear wheel, and

then to rotate said gear wheel, means to hold said lock in disengaged position during the rotation at the gear wheel, and a swinging arm actuated by said operating mechanismadapted. automatically both to disengage said wheel-rotating -1hechanism and positive]; to reset said lock at theendzof each rotation of said gear wheel.. 1

I 4. Ina computingmachine, a gear wheel for ,actuatin lock normally holdingl s'aid gear wheel lithe computing numerals, a

against rotation provided with an arm proectlng inward beslde saldgear -wheel, a normally (.llsengaged'drlving pawl for r0- tating said gear wheel, operating'mechanism adapted to disengage said lock, engage said drlvlng pawl wlth sa-ld gear Wheel and rotate said gear wheel, and a swinging "arm actuated from said operating mechanism adapted to disengage said driving pawl from said gear Wheel and also to strike pivoted lock normally holding said gear Wheel against rotation having a tail piece by which the lock is disengaged from the gear wheel, an endwise movable bar hav-' mg a shoulder near-the top for actuating); said tail piece, another shoulder near the lower end of said bar, and a lever having a latch pivoted to itsend to engage the last named shoulder and move said bar endwisc.

Signed by me at Boston, Massachusetts,

.this seventeenth day of Jilly, 1912.

GEORGE WALKER. lVit-nesses ROBERT CUsHMAN, CHARLES D. VOODBERRY.

Copies of this patent may be obtained for live cents ealch, by addressing the Commissioner of Patents, Washington, D. 0. 

